[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/pre-commit/mirrors-prettier: ffb6a759a979008c0e6dff86e39f4745a2d9eac4 → f12edd9c7be1c20cfa42420fd0e6df71e42b51ea](pre-commit/mirrors-prettier@ffb6a75...f12edd9)

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -24,7 +24,7 @@ repos:
       - id: blacken-docs
 
   - repo: https://github.com/pre-commit/mirrors-prettier
-    rev: ffb6a759a979008c0e6dff86e39f4745a2d9eac4 # frozen: v3.1.0
+    rev: f12edd9c7be1c20cfa42420fd0e6df71e42b51ea  # frozen: v4.0.0-alpha.8
     hooks:
       - id: prettier
         files: \.(css|md|yml|yaml)